package com.chinasoftosg.sicap.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.chinasoftosg.sicap.utils.ConstantUtil;
import com.opensymphony.xwork2.ActionSupport;

public class VcodeAction extends ActionSupport
{
    private static final long serialVersionUID = -6892081227463287145L;
    
    public static final String STRING_CODE = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    
    public String execute() throws IOException
    {
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();
        // 设置返回格式
        response.setContentType("image/jpeg");
        // 清空缓存
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        HttpSession session = request.getSession();
        // 设置宽度
        int width = 60, height = 20;
        BufferedImage bi = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_BGR);
        Graphics g = bi.getGraphics();
        
        Random random = new Random();
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++)
        {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }
        
        String sRand = "";
        for (int i = 0; i < 4; i++)
        {
            // String rand = String.valueOf(random.nextInt(10));
            int n = random.nextInt(STRING_CODE.length());
            String rand = STRING_CODE.substring(n, n + 1);
            
            sRand += rand;
            // sRand += rand;
            g.setColor(new Color(20 + random.nextInt(110),
                    20 + random.nextInt(110), 20 + random.nextInt(110)));
            g.drawString(rand, 13 * i + 6, 16);
        }
        session.setAttribute(ConstantUtil.V_CODE, sRand);
        g.dispose();
        ServletOutputStream responseOutputStream = response.getOutputStream();
        ImageIO.write(bi, "JPEG", responseOutputStream);
        responseOutputStream.flush();
        responseOutputStream.close();
        return null;
    }
    
    private Color getRandColor(int fc, int bc)
    {
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}
